[php-src] Issue #20721: xml memory leak

Issue: https://github.com/php/php-src/issues/20721
Author: chongwick

### Description

The following code:

```php
<?php
$v_847 = STDOUT;
$v_848 = fclose($v_847,);
$v_2964 = new SoapServer($v_848,);
```

Resulted in this output:
```
=================================================================
==2545344==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 343 byte(s) in 1 object(s) allocated from:
    #0 0x6829fd in malloc (/home/w023dtc/nightly_php/php-src/sapi/cli/php+0x6829fd)
    #1 0x14a4a27fe6b3 in xmlStrndup (/lib/x86_64-linux-gnu/libxml2.so.2+0xe36b3)

Indirect leak of 600 byte(s) in 5 object(s) allocated from:
    #0 0x6829fd in malloc (/home/w023dtc/nightly_php/php-src/sapi/cli/php+0x6829fd)
    #1 0x14a4a277d5f4 in xmlNewNode (/lib/x86_64-linux-gnu/libxml2.so.2+0x625f4)

Indirect leak of 176 byte(s) in 1 object(s) allocated from:
    #0 0x6829fd in malloc (/home/w023dtc/nightly_php/php-src/sapi/cli/php+0x6829fd)
    #1 0x14a4a277d217 in xmlNewDoc (/lib/x86_64-linux-gnu/libxml2.so.2+0x62217)

Indirect leak of 121 byte(s) in 6 object(s) allocated from:
    #0 0x6829fd in malloc (/home/w023dtc/nightly_php/php-src/sapi/cli/php+0x6829fd)
    #1 0x14a4a27fe6b3 in xmlStrndup (/lib/x86_64-linux-gnu/libxml2.so.2+0xe36b3)

Indirect leak of 120 byte(s) in 1 object(s) allocated from:
    #0 0x6829fd in malloc (/home/w023dtc/nightly_php/php-src/sapi/cli/php+0x6829fd)
    #1 0x14a4a277d87b in xmlNewText (/lib/x86_64-linux-gnu/libxml2.so.2+0x6287b)

Indirect leak of 120 byte(s) in 1 object(s) allocated from:
    #0 0x6829fd in malloc (/home/w023dtc/nightly_php/php-src/sapi/cli/php+0x6829fd)
    #1 0x14a4a277e9eb in xmlNewTextLen (/lib/x86_64-linux-gnu/libxml2.so.2+0x639eb)

Indirect leak of 63 byte(s) in 3 object(s) allocated from:
    #0 0x6829fd in malloc (/home/w023dtc/nightly_php/php-src/sapi/cli/php+0x6829fd)
    #1 0x14a4a27fe7c2 in xmlStrdup (/lib/x86_64-linux-gnu/libxml2.so.2+0xe37c2)

Indirect leak of 48 byte(s) in 1 object(s) allocated from:
    #0 0x6829fd in malloc (/home/w023dtc/nightly_php/php-src/sapi/cli/php+0x6829fd)
    #1 0x14a4a277cb0d in xmlNewNs (/lib/x86_64-linux-gnu/libxml2.so.2+0x61b0d)

Indirect leak of 6 byte(s) in 1 object(s) allocated from:
    #0 0x6829fd in malloc (/home/w023dtc/nightly_php/php-src/sapi/cli/php+0x6829fd)
    #1 0x14a4a27fe962 in xmlCharStrdup (/lib/x86_64-linux-gnu/libxml2.so.2+0xe3962)

Indirect leak of 5 byte(s) in 1 object(s) allocated from:
    #0 0x6829fd in malloc (/home/w023dtc/nightly_php/php-src/sapi/cli/php+0x6829fd)
    #1 0x14a4a280142b in xmlBufResize (/lib/x86_64-linux-gnu/libxml2.so.2+0xe642b)

SUMMARY: AddressSanitizer: 1602 byte(s) leaked in 21 allocation(s).
```



### PHP Version

```plain
nightly
```

### Operating System

ubuntu 22.04